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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
1
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

807 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.73 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

14 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.51 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.24 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
7 PASS 1 REVIEW 5 FIX
D
Page Weight Budget
Action
2.6 MB transferred, 65 requests
FIX
2.6 MB transferred, 65 requests
Warning::
Page weighs 6.4 MB (2.6 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
65 HTTP requests
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
65 requests
0.54 g CO2 per page load
JavaScript 1.5 MiB 58%
Images 978.4 KiB 37%
CSS 76.0 KiB 3%
Other 24.9 KiB 1%
Other 22.0 KiB 1%
HTML 11.0 KiB 0%
Other 4.1 KiB 0%
Other 553 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
23 scripts, 720 KB unused
FIX
23 scripts, 720 KB unused
Warning::
https://ads.adthrive.com/builds/core/fb57663/es201...: 163 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 130 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ads.adthrive.com/builds/core/fb57663/gdpr/...: 125 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s3.amazonaws.com/downloads.mailchimp.com/j...: 90 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VTWQ...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 720 KB
720 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ads.adthrive.com/builds/core/fb57663/es2018/js/adthrive.min.js?deployment=2026-04-21-08:ada-1839:fb57663:4&bucket=flex-74&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5dc336ff22eddf534ab4417c369 KB163 KB (44%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946187 KB130 KB (69%)✓3rd
https://ads.adthrive.com/builds/core/fb57663/gdpr/vendor/prebid/es2018/prebid.min.js159 KB125 KB (79%)✓3rd
https://s3.amazonaws.com/downloads.mailchimp.com/js/mc-validate.js140 KB90 KB (64%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VTWQL8EHT3&cx=c&gtm=4e64h1155 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB117 KB62 KB (53%)✓3rd
https://c.aps.amazon-adsystem.com/apstag.js78 KB50 KB (65%)✓3rd
https://cdn.consentmanager.net/delivery/js/cmp_final.min.js101 KB37 KB (37%)✓3rd
https://www.encyclopedia.com/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.js11 KB—✓3rd
https://www.encyclopedia.com/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.js5 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
65 resources · 2.6 MB · 720 KB savings available
FIX
65 resources · 2.6 MB · 720 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~720 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
2 resources over 200KB
65 resources · 2.6 MiB · 64 third-party 1.6 MiB over 1MB target
JavaScript 58% · 1.5 MiB
Image 37% · 979.9 KiB
CSS 3% · 76.0 KiB
Other 2% · 47.0 KiB
Document 0% · 11.0 KiB

~720.1 KiB of savings available

Remove unused JavaScript: 720.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.encyclopedia.com/sites/default/files/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 978 KB
0 oversized -0 KB
12 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
493ms total JS execution
PASS
493ms total JS execution
Info::
Unattributable: 143ms CPU time
Info::
https://www.encyclopedia.com/: 96ms CPU time
Info::
https://ads.adthrive.com/builds/core/fb57663/es201...: 92ms CPU time
Info::
https://c.aps.amazon-adsystem.com/apstag.js: 82ms CPU time
Info::
https://cdn.consentmanager.net/delivery/customdata...: 80ms CPU time
Warning::
Third-party scripts: 493ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 16% Script Parsing & Compilation 12% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable143ms59ms0ms3rd
https://www.encyclopedia.com/96ms3ms0ms3rd
https://ads.adthrive.com/builds/core/fb57663/es2018/js/adthrive.min.js?deployment=2026-04-21-08:ada-1839:fb57663:4&bucket=flex-74&deliveryFeatures=additiveRaptiveFloors,altsdm,altv2,amazonBetaApstag,consentManagerCMP,cv2,dlc,es2021,hb_crid,i262,ld,nvc,ok,pbis,raptiveFloors,raptiveManualCookieSync,recencyFrequency,reissuingSticky,removeAdHost,rpbsecs,rpr,rrassf,stickyBucketsLocalStorage,stickyV2,switzerlandGdpr,trafficShaping,usdk,prebidLoad,gptLoad,amazonLoad,ttdSync&siteid=5dc336ff22eddf534ab4417c92ms59ms30ms3rd
https://c.aps.amazon-adsystem.com/apstag.js82ms72ms7ms3rd
https://cdn.consentmanager.net/delivery/customdata/bV8xLndfODY2ODUucl9HRFBSLmxfZW4uZF81MzQ3MS54XzExNC52LnAudF81MzQ3MS54dF8xNTA.js80ms75ms2ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
65 requests over 2069ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 807 ms LCP 1.7 shttps://encyclopedia.com// https://encyclopedia.com/ — 301 — 462 B — 46 ms — h3https://www.encyclopedia.com/www.encyclopedia.com/ https://www.encyclopedia.com/ — 200 — 11.0 KiB — 47 ms — h3https://www.encyclopedia.com/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nPkuzEFUTf02NmHtU.csswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/css/css_AxrMp2NNpMECnjp7kzTMN0neY6nPkuzEFUTf02NmHtU.css — 200 — 2.5 KiB — 28 ms — h3https://www.encyclopedia.com/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7i9DxnaRGocb8JzA.csswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/css/css_PKoD1c51rXhDWjoL2z3EIsRnpif7i9DxnaRGocb8JzA.css — 200 — 23.6 KiB — 98 ms — h3https://www.encyclopedia.com/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZKAL5HHw12USc5C1U.csswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/css/css_k9u1IODySqC3j4I1pBBMqRSLt5ZKAL5HHw12USc5C1U.css — 200 — 47.0 KiB — 106 ms — h3https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=https%3A%2F%2Fwww.encyclopedia.com%2F&cb=33ads.adthrive.com/sites/5dc336ff22ed... https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.js?referrer=https%3A%2F%2Fwww.encyclopedia.com%2F&cb=33 — 200 — 33.8 KiB — 320 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-W4GBLXBwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-W4GBLXB — 200 — 117.4 KiB — 133 ms — h2https://cdn-images.mailchimp.com/embedcode/classic-061523.csscdn-images.mailchimp.com/embedcode/... https://cdn-images.mailchimp.com/embedcode/classic-061523.css — 200 — 1.8 KiB — 11 ms — h3https://www.encyclopedia.com/themes/custom/trustme/images/header-logo.jpgwww.encyclopedia.com/themes/custom/... https://www.encyclopedia.com/themes/custom/trustme/images/header-logo.jpg — 200 — 13.8 KiB — 88 ms — h3https://www.encyclopedia.com/sites/default/files/images/hero/OxfordLogo%402x_2.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/OxfordLogo%402x_2.png — 200 — 2.5 KiB — 60 ms — h3https://www.encyclopedia.com/sites/default/files/images/hero/ColumbiaLogo%402x_1.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/ColumbiaLogo%402x_1.png — 200 — 4.4 KiB — 66 ms — h3https://www.encyclopedia.com/sites/default/files/images/hero/CengageLogo%402x_2.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/CengageLogo%402x_2.png — 200 — 2.9 KiB — 61 ms — h3https://www.encyclopedia.com/sites/default/files/images/whouseit/a70c83d26434d18cd9089a26ad0064f6%20%281%29.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/whouseit/a70c83d26434d18cd9089a26ad0064f6%20%281%29.png — 200 — 24.2 KiB — 93 ms — h3https://www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/whouseit/nasa2.png — 200 — 19.8 KiB — 92 ms — h3https://www.encyclopedia.com/sites/default/files/images/whouseit/nytimes-logo-png-new-york-times-speaks-to-dr-derevensky-regarding-internet-gambling-fantasy-sports-betting-430.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/whouseit/nytimes-logo-png-new-york-times-speaks-to-dr-derevensky-regarding-internet-gambling-fantasy-sports-betting-430.png — 200 — 22.5 KiB — 92 ms — h3https://www.encyclopedia.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.jswww.encyclopedia.com/cdn-cgi/script... https://www.encyclopedia.com/cdn-cgi/scripts/7d0fa10a/cloudflare-static/rocket-loader.min.js — 200 — 4.2 KiB — 56 ms — h3data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIg…data:image/svg+xml;utf8;base64,PHN2... data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIg… — 200 — 0 B — 0 ms — datahttps://www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.pngwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/images/hero/enc_hero01_3.png — 200 — 568.7 KiB — 110 ms — h3data:image/svg+xml;utf8;base64,PHN2ZyB3aWR0aD0iMzYiIGhlaWdodD0iMzYiIHZpZXdCb3g9IjAgMCAxNiAxNiIgeG1s…data:image/svg+xml;utf8;base64,PHN2... data:image/svg+xml;utf8;base64,PHN2ZyB3aWR0aD0iMzYiIGhlaWdodD0iMzYiIHZpZXdCb3g9IjAgMCAxNiAxNiIgeG1s… — 200 — 0 B — 0 ms — datahttps://www.encyclopedia.com/sites/default/files/0/627218.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/0/627218.jpg — 200 — 46.3 KiB — 68 ms — h3https://www.encyclopedia.com/sites/default/files/4/2792955.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/4/2792955.jpg — 200 — 42.6 KiB — 67 ms — h3https://www.encyclopedia.com/sites/default/files/6/2801633.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/6/2801633.jpg — 200 — 43.6 KiB — 80 ms — h3https://www.encyclopedia.com/sites/default/files/4/2793250.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/4/2793250.jpg — 200 — 76.8 KiB — 99 ms — h3https://www.encyclopedia.com/sites/default/files/4/2796049.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/4/2796049.jpg — 200 — 44.2 KiB — 96 ms — h3https://www.encyclopedia.com/sites/default/files/6/2801644.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/6/2801644.jpg — 200 — 23.6 KiB — 86 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_zUQZP_05aEQQEOMOyF3c6jn8AsMhZPB5lR08eWRX8vY.js — 200 — 4.5 KiB — 39 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_WGXfBW_MzOchPG9FUX5M7UvHZXqRJrIQ3Tfnf5S1iHg.js — 200 — 11.4 KiB — 52 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_yLV6HYxC2Rnf9ZekS8oWsZmUNhr7FkzcQDF4zydcT90.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_yLV6HYxC2Rnf9ZekS8oWsZmUNhr7FkzcQDF4zydcT90.js — 200 — 14.2 KiB — 66 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_7riCSsmZKOyjnTzzQILMa9_W2mWycOMuqO6ECCFCXEk.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_7riCSsmZKOyjnTzzQILMa9_W2mWycOMuqO6ECCFCXEk.js — 200 — 15.0 KiB — 66 ms — h3https://www.encyclopedia.com/sites/default/files/js/js_zqxY3WQzYNR0NiKCpM5itT0--wb4EaKcun2onM0X1is.jswww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/js/js_zqxY3WQzYNR0NiKCpM5itT0--wb4EaKcun2onM0X1is.js — 200 — 9.6 KiB — 66 ms — h3
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h3https://www.encyclopedia.com/pick_of_the_week?_format=jsonwww.encyclopedia.com/pick_of_the_we... https://www.encyclopedia.com/pick_of_the_week?_format=json — 200 — 1.3 KiB — 27 ms — h3https://cdn.jwplayer.com/v2/playlists/WQuApcCp?max_resolution=1280cdn.jwplayer.com/v2/playlists/WQuAp... https://cdn.jwplayer.com/v2/playlists/WQuApcCp?max_resolution=1280 — 200 — 1.6 KiB — 37 ms — h2https://config.aps.amazon-adsystem.com/configs/4fbba76f-7987-4fa2-9733-c27eb3a2170bconfig.aps.amazon-adsystem.com/conf... https://config.aps.amazon-adsystem.com/configs/4fbba76f-7987-4fa2-9733-c27eb3a2170b — 200 — 2.3 KiB — 11 ms — h2https://c.amazon-adsystem.com/cdn/prod/config?src=600&u=https%3A%2F%2Fwww.encyclopedia.com&pubid=4fbba76f-7987-4fa2-9733-c27eb3a2170bc.amazon-adsystem.com/cdn/prod/conf... https://c.amazon-adsystem.com/cdn/prod/config?src=600&u=https%3A%2F%2Fwww.encyclopedia.com&pubid=4fbba76f-7987-4fa2-9733-c27eb3a2170b — 200 — 1.5 KiB — 10 ms — h2https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.cssads.adthrive.com/sites/5dc336ff22ed... https://ads.adthrive.com/sites/5dc336ff22eddf534ab4417c/ads.min.css — 200 — 1.0 KiB — 3 ms — h2data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIg…data:image/svg+xml;utf8;base64,PHN2... data:image/svg+xml;utf8;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMCIg… — 200 — 0 B — 0 ms — datahttps://www.encyclopedia.com/sites/default/files/3/2014558.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/3/2014558.jpg — 200 — 4.9 KiB — 26 ms — h3https://www.encyclopedia.com/sites/default/files/10/5985964.jpgwww.encyclopedia.com/sites/default/... https://www.encyclopedia.com/sites/default/files/10/5985964.jpg — 200 — 36.2 KiB — 27 ms — h3https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1165474574&t=pageview&_s=1&dl=https%3A%2F%2Fwww.encyclopedia.com%2F&ul=en-us&dt=Encyclopedia.com%20%7C%20Free%20Online%20Encyclopedia&sr=800x600&vp=1350x940&_u=IADAAEABAAAAACAAI~&jid=706709836&gjid=1758437896&cid=1952116991.1776806964&tid=UA-64847704-1&_gid=1668644304.1776806965&_r=1&_slc=1&z=214977620www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1165474574&t=pageview&_s=1&dl=https%3A%2F%2Fwww.encyclopedia.com%2F&ul=en-us&dt=Encyclopedia.com%20%7C%20Free%20Online%20Encyclopedia&sr=800x600&vp=1350x940&_u=IADAAEABAAAAACAAI~&jid=706709836&gjid=1758437896&cid=1952116991.1776806964&tid=UA-64847704-1&_gid=1668644304.1776806965&_r=1&_slc=1&z=214977620 — 200 — 456 B — 27 ms — h2https://pagead2.googlesyndication.com/pagead/ping?e=1pagead2.googlesyndication.com/pagea... https://pagead2.googlesyndication.com/pagead/ping?e=1 — 204 — 20 B — 76 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 493ms · 480KB · €5/mo
Unattributable
Other
Optional
Execution 143ms
Transfer 0 KB
Monthly Cost €2/mo
www.encyclopedia.com
Other
Optional
Execution 96ms
Transfer 11 KB
Monthly Cost €1/mo
ads.adthrive.com
Other
Optional
Execution 92ms
Transfer 369 KB
Unused 44%
Monthly Cost €1/mo
c.aps.amazon-adsystem.com
Other
Optional
Execution 82ms
Transfer 78 KB
Unused 65%
Monthly Cost €1/mo
cdn.consentmanager.net
Other
Optional
Execution 80ms
Transfer 21 KB
Monthly Cost €1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

65% of c.aps.amazon-adsystem.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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